Move layout traits into library

1 files changed, 0 insertions, 142 deletions

diff --git a/src/model/layout.rs b/src/model/layout.rs
deleted file mode 100644
index e8aa0e96..00000000
--- a/src/model/layout.rs
+++ /dev/null
@@ -1,142 +0,0 @@
-//! Layouting infrastructure.
-
-use std::hash::Hash;
-
-use comemo::Tracked;
-
-use super::{Builder, Capability, Content, Scratch, StyleChain};
-use crate::diag::SourceResult;
-use crate::frame::Frame;
-use crate::geom::{Abs, Axes, Size};
-use crate::World;
-
-/// Layout content into a collection of pages.
-#[comemo::memoize]
-pub fn layout(world: Tracked<dyn World>, content: &Content) -> SourceResult<Vec<Frame>> {
-    let styles = StyleChain::with_root(&world.config().styles);
-    let scratch = Scratch::default();
-
-    let mut builder = Builder::new(world, &scratch, true);
-    builder.accept(content, styles)?;
-
-    let (doc, shared) = builder.into_doc(styles)?;
-    doc.layout(world, shared)
-}
-
-/// A node that can be layouted into a sequence of regions.
-///
-/// Layouting returns one frame per used region.
-pub trait Layout: 'static + Sync + Send {
-    /// Layout this node into the given regions, producing frames.
-    fn layout(
-        &self,
-        world: Tracked<dyn World>,
-        regions: &Regions,
-        styles: StyleChain,
-    ) -> SourceResult<Vec<Frame>>;
-
-    /// Whether this is an inline-level or block-level node.
-    fn level(&self) -> Level;
-}
-
-impl Capability for dyn Layout {}
-
-/// At which level a node operates.
-#[derive(Debug, Copy, Clone, Eq, PartialEq)]
-pub enum Level {
-    Inline,
-    Block,
-}
-
-/// A sequence of regions to layout into.
-#[derive(Debug, Clone, Hash)]
-pub struct Regions {
-    /// The (remaining) size of the first region.
-    pub first: Size,
-    /// The base size for relative sizing.
-    pub base: Size,
-    /// The height of followup regions. The width is the same for all regions.
-    pub backlog: Vec<Abs>,
-    /// The height of the final region that is repeated once the backlog is
-    /// drained. The width is the same for all regions.
-    pub last: Option<Abs>,
-    /// Whether nodes should expand to fill the regions instead of shrinking to
-    /// fit the content.
-    pub expand: Axes<bool>,
-}
-
-impl Regions {
-    /// Create a new region sequence with exactly one region.
-    pub fn one(size: Size, base: Size, expand: Axes<bool>) -> Self {
-        Self {
-            first: size,
-            base,
-            backlog: vec![],
-            last: None,
-            expand,
-        }
-    }
-
-    /// Create a new sequence of same-size regions that repeats indefinitely.
-    pub fn repeat(size: Size, base: Size, expand: Axes<bool>) -> Self {
-        Self {
-            first: size,
-            base,
-            backlog: vec![],
-            last: Some(size.y),
-            expand,
-        }
-    }
-
-    /// Create new regions where all sizes are mapped with `f`.
-    ///
-    /// Note that since all regions must have the same width, the width returned
-    /// by `f` is ignored for the backlog and the final region.
-    pub fn map<F>(&self, mut f: F) -> Self
-    where
-        F: FnMut(Size) -> Size,
-    {
-        let x = self.first.x;
-        Self {
-            first: f(self.first),
-            base: f(self.base),
-            backlog: self.backlog.iter().map(|&y| f(Size::new(x, y)).y).collect(),
-            last: self.last.map(|y| f(Size::new(x, y)).y),
-            expand: self.expand,
-        }
-    }
-
-    /// Whether the first region is full and a region break is called for.
-    pub fn is_full(&self) -> bool {
-        Abs::zero().fits(self.first.y) && !self.in_last()
-    }
-
-    /// Whether the first region is the last usable region.
-    ///
-    /// If this is true, calling `next()` will have no effect.
-    pub fn in_last(&self) -> bool {
-        self.backlog.len() == 0 && self.last.map_or(true, |height| self.first.y == height)
-    }
-
-    /// Advance to the next region if there is any.
-    pub fn next(&mut self) {
-        if let Some(height) = (!self.backlog.is_empty())
-            .then(|| self.backlog.remove(0))
-            .or(self.last)
-        {
-            self.first.y = height;
-            self.base.y = height;
-        }
-    }
-
-    /// An iterator that returns the sizes of the first and all following
-    /// regions, equivalently to what would be produced by calling
-    /// [`next()`](Self::next) repeatedly until all regions are exhausted.
-    /// This iterater may be infinite.
-    pub fn iter(&self) -> impl Iterator<Item = Size> + '_ {
-        let first = std::iter::once(self.first);
-        let backlog = self.backlog.iter();
-        let last = self.last.iter().cycle();
-        first.chain(backlog.chain(last).map(|&h| Size::new(self.first.x, h)))
-    }
-}